/Engine/Source/Editor/PropertyEditor/Public/IDetailPropertyRow.h
Sets a handler for this property row to be a source or target of drag-and-drop operations
[IDetailPropertyRow](API\Editor\PropertyEditor\IDetailPropertyRow) & DragDropHandler ( [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [IDetailDragDropHandler](API\Editor\PropertyEditor\IDetailDragDropHandler) > InDragDropHandler )